How big is a drop?

How big is a drop, how do you measure gravitational waves and how do we get accents?
19 February 2016
Presented by Chris Smith, Redi Tlhabi

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How big is a drop, how do you measure gravitational waves, how do we get accents, why is there thunder after a heatwave and how do trees know when to produce tannin? Plus in the news - a breakthrough in 3D printing organs and bones.

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